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Rubberband Pullback Dragster . Lego dragster powered by rubberbands, very fast and dangerous too !! Structure is very balanced, everything is around centerline. I'm using 4 strings, tires cant handle more due to limited grip. A launching lever is in the back, press it and boom ... Frame is very rigid and wont break apart. My first versions had some problems with this and with full tension it either go or explodes on my hands like mousetrap :( . Trigger is on top, push down to release the power. A reliable trigger was difficult to find. Earlier versions may go off at any second .. Even this causes some nasty surprises time to time since all that tension is behind one little gear tooth !! Note those little wheels inside rear-wheels. They add weight and makes wheels accelerate little slower, less spinning. In LDD-file you find a lock system for that one way clutch. Front weights for wheelie control. In the start there should be a little wheelie. So all the weight is on rear-wheels. 0-3 weight wheels are used depending on the grip available. Twin drums assembly. Currently using 4 strings, since more only causes spinning. Basically its about how much tension this can take without exploding ;) i'm allready close to the limits.... I've tried to measure the acceleration and it goes 1 meter (100cm) in less than 1 second. Average speed 40km/h+ And a performance video:


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